TWI394982B - Projection apparatus and projection lens - Google Patents

Description

Projection device and projection lens

The present invention relates to a display device and a lens, and more particularly to a projection device and a projection lens.

With the advancement of display technology, various display devices different from conventional cathode ray tubes (CRTs) have been extensively developed and promoted, and these display devices include liquid crystal displays (LCDs) and plasma displays ( A flat panel display such as a plasma display panel (PDP) or an organic light emitting diode (OLED) display. In addition, displays that have been extensively developed and promoted include projectors such as projectors and rear projection displays.

Although the display in daily life is mainly a liquid crystal display and a plasma display, the projection device has a large size (for example, more than 52 inches) at a low cost, and thus has a large-sized display field. Unable to be replaced by status. In addition, with the advancement of manufacturing technology, the mass production of projectors is also moving toward lower cost and lower price, so nowadays projectors are used in addition to office or teaching research units for briefings. There is a trend to promote to the family theater.

In a projection device, an illumination system is used to form an illumination beam that is incident on a light valve, and the light valve converts the illumination beam into an image beam. The projection lens is disposed on the transmission path of the image beam to project the image beam onto the screen to form an image frame.

In projection devices, an anamorphic lens is used to achieve some special optical effects or to improve optical quality. For example, U.S. Patent No. 6,299,312 employs a dovetail disposed between a combined aperture and a projection lens to correct chromatic aberrations and aberrations produced by the pupil. U.S. Patent No. 6,688,748 uses a dovetail in a projection system that is placed in front of the display to deflect the direction of the image beam. The display is tilted at an angle to correct for trapezoidal aberrations, and the center of the display is offset from the optical axis to optimize the projected image.

U.S. Patent No. 6,479,429 uses an image distortion correction prism between a dichroic cross prism and a projection lens to correct aberrations. In addition, U.S. Patent No. 6,512,636 employs two cylindrical lenses in a projection lens to change the aspect ratio of the projected picture.

Although the above-described setting of the lens has solved the problems of some projection devices and improved some optical qualities, the problems described below have not yet been solved.

Since the projection device is usually placed on a table or a ceiling, and the image beam is projected on the screen to generate an image, the image beam is emitted off the optical axis of the projection lens, so that the image is off-axis and the image beam is prevented from being projected. The desktop or ceiling does not project correctly on the screen. In order to cause the image beam to be emitted obliquely with respect to the optical axis of the projection lens and to deflect the image frame from the optical axis, the conventional technique employs a method of shifting the light valve away from the optical axis. In addition, with this technique, the degree of deviation of the light valve from the optical axis is the same as the deviation of the image frame from the optical axis. For example, if you want to make an image The face is offset from the optical axis by an offset of Z%, so that the light valve is also offset from the optical axis by an offset of Z%.

However, an excessive light valve offset may cause the maximum field of the projection lens to be too large, so that the outer diameter of the lens in the projection lens is difficult to be reduced, resulting in an excessive volume of the projection lens, thereby making the projection device too large.

The invention provides a projection device with a projection lens that does not occupy a space.

The present invention provides a projection lens having a small volume.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

To achieve one or a portion or all of the above or other objects, an embodiment of the present invention provides a projection apparatus adapted to project an image frame on a screen. The projection device includes a light valve and a projection lens. The light valve is adapted to generate an image beam. The projection lens is disposed on the transmission path of the image beam and is disposed between the light valve and the screen to project the image beam onto the screen to form an image frame. The projection lens has an optical axis, and the light valve is offset from the optical axis by an X% offset in a first direction, and the image frame is offset from the optical axis by a Y% offset in a second direction, and the first direction is The second direction is opposite. The projection lens includes a lens group and an imaging element. The lens group is disposed on the transmission path of the image beam. The imaging element is disposed on the transmission path of the image beam and disposed between the lens group and the screen such that X% < Y%. The imaging element includes an image-transparent sheet, and the image-transparent sheet has a suitable image for the image. The first light passing through the beam passes through the region. The first light passing region has a first end and a second end, and a first extending direction from the first end to the second end is less than 90 degrees from the second direction, and the first light passing region is in the second The thickness of the end is greater than the thickness of the first light passage region at the first end.

In an embodiment of the invention, the thickness of the first light passage region is increased from the first end to the second end. The first light-passing surface may have a first light-incident surface and a first light-emitting surface, and the first light-emitting surface is disposed between the first light-incident surface and the screen, and the first light-incident surface and the first light-emitting surface are respectively A plane, and the image is a light transmissive sheet. In an embodiment of the present invention, the first light passing region has a first light incident surface and a first light emitting surface, and the first light emitting surface is disposed between the first light incident surface and the screen. The surface and the first light-emitting surface are each a curved surface, and the image-transparent sheet is a lens. In an embodiment of the present invention, the first light passing region has a first light incident surface and a first light emitting surface, and the first light emitting surface is disposed between the first light incident surface and the screen. One of the surface and the first light-emitting surface is a curved surface, and the other of the first light-incident surface and the first light-emitting surface is a plane, and the image-transparent sheet is a lens.

In an embodiment of the invention, the imaging element further includes a compensating light transmissive sheet disposed between the matte light transmissive sheet and the screen. The compensation light transmissive sheet has a second light passage region adapted to pass the image beam, and the second light passage region has a third end and a fourth end. An angle between a second extending direction from the third end to the fourth end and the second direction is less than 90 degrees, and a thickness of the second light passing region at the fourth end is smaller than a thickness of the second light passing region at the third end.

In an embodiment of the invention, the thickness of the second light passage region is determined by The four ends are incremented toward the third end. The second light passing area may have a second light incident surface and a second light emitting surface, the second light emitting surface is disposed between the second light incident surface and the screen, and the second light incident surface and the second light emitting surface are respectively A plane, and the compensation light transmissive sheet is a light transmissive crucible. In an embodiment of the present invention, the second light passing region has a second light incident surface and a second light emitting surface, and the second light emitting surface is disposed between the second light incident surface and the screen, and the second light incident surface The surface and the second illuminating surface are each a curved surface, and the compensation transparent sheet is a lens. In an embodiment of the present invention, the second light passing region has a second light incident surface and a second light emitting surface, and the second light emitting surface is disposed between the second light incident surface and the screen, and the second light incident surface One of the surface and the second light-emitting surface is a curved surface, and the other of the second light-incident surface and the second light-emitting surface is a plane, and the compensation light-transmitting sheet is a lens.

In an embodiment of the invention, the first light passing region has a first light incident surface and a first light emitting surface, and the first light emitting surface is disposed between the first light incident surface and the compensation light transmitting sheet. The second light passing area may have a second light incident surface and a second light emitting surface, and the second light emitting surface is disposed between the second light incident surface and the screen. The second light incident surface can bear against the first light exit surface, and the shape of the second light incident surface can substantially coincide with the shape of the first light exit surface.

In one embodiment of the invention, a normal vector of the active surface of one of the light valves is tilted relative to the optical axis. The lens group may include at least one tilting lens, an optical axis of the tilting lens being inclined with respect to an optical axis of the projection lens. The lens group can include at least one eccentric lens that maintains a geometric center of the eccentric lens at a distance from the optical axis of the projection lens.

Another embodiment of the present invention provides a projection apparatus adapted to project an image frame on a screen. The projection device includes a light valve and a projection Lens. The light valve is adapted to generate an image beam. The projection lens is disposed on the transmission path of the image beam and is disposed between the light valve and the screen to project the image beam onto the screen to form an image frame. The projection lens has an optical axis, the light valve is offset from the optical axis in a first direction, the image frame is offset from the optical axis in a second direction, and the first direction is opposite to the second direction. The projection lens includes a lens group and an imaging element. The lens group is disposed on the transmission path of the image beam. The imaging element is disposed on the transmission path of the image beam and disposed between the lens group and the screen. The imaging element includes an aperture-like light-transmissive sheet having a first light-passing region adapted to pass an image beam, the first light-passing region having a first end and a second end. An angle between a first extending direction from the first end to the second end and the second direction is less than 90 degrees, and a thickness of the first light passing region at the second end is greater than a thickness of the first light passing region at the first end.

Yet another embodiment of the present invention provides a projection lens adapted to project an image beam generated by a light valve onto a screen to produce an image frame. The projection lens includes an optical axis, a lens group and an imaging element. The light valve is offset from the optical axis by an X% offset in a first direction, and the image frame is offset from the optical axis by a Y% offset in a second direction, and the first direction is opposite the second direction. The lens group is disposed on the transmission path of the image beam. The imaging element is disposed on the transmission path of the image beam and disposed between the lens group and the screen such that X% < Y%. The imaging element includes an image-transparent sheet having a first light passage region adapted to pass the image beam. The first light passing region has a first end and a second end, and a first extending direction from the first end to the second end is less than 90 in the second direction. And a thickness of the first light passage region at the second end is greater than a thickness of the first light passage region at the first end.

In view of the above, the projection lens of the embodiment of the present invention employs an imaging element, and wherein the thickness of the first light passage region of the aperture-like light-transmissive sheet at the second end is greater than the thickness of the first light-passing region at the first end. The offset of the image frame relative to the optical axis can be increased by the refraction of the image-transparent sheet, so that the offset of the light valve relative to the optical axis can be designed to be smaller, thereby shortening the maximum field. In this way, the outer diameter of the lens in the projection lens can be small to reduce the volume of the projection lens. In addition, since the projection device of the embodiment of the present invention adopts the projection lens, the projection lens does not occupy a space, so that the volume of the projection device can be reduced, the weight is light, and the cost is low.

The above described features and advantages of the present invention will be more apparent from the following description.

The following description of the various embodiments is provided to illustrate the specific embodiments of the invention. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", etc., are merely directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

1 is a schematic structural view of a projection apparatus according to an embodiment of the present invention. Referring to FIG. 1, the projection apparatus 100 of the present embodiment is adapted to project an image frame 60 on a screen 50. The projection device 100 includes a light valve 110 and a projection lens 120. Light valve 110 is adapted to generate an image beam 112. In this embodiment, the projection device 100 further includes an illumination system 130, and the illumination system The system 130 is adapted to emit an illumination beam 132. In the present embodiment, the illumination beam 132 can be concentrated on the light valve 110 via a field lens 140. The light valve 110 is, for example, a digital micro-mirror device (DMD). However, in other embodiments, the light valve 110 can also be a liquid-crystal-on-silicon panel (LCOS panel) or other spatial light modulator. Light valve 110 reflects and converts illumination beam 132 into image beam 112, which passes through field lens 140.

The projection lens 120 is disposed on the transmission path of the image beam 112 and disposed between the light valve 110 and the screen 50 to project the image beam 112 onto the screen 50 to form an image frame 60. The projection lens has an optical axis P, and the light valve 110 is offset from the optical axis P by an X% offset in a first direction D1, and the image frame 60 is offset from the optical axis by a Y% offset in a second direction D2. P, and the first direction D1 is opposite to the second direction D2.

In this specification, the offset is defined by the following formula:

Where A is the distance from the edge of the optical axis P of the light valve or image picture closer to the projection lens 120 to the optical axis P. If the optical axis P passes through a point in the light valve or image frame, the value of A is a negative value. Conversely, if the optical axis P does not intersect the light valve or image frame, the value of A is a positive value. H is the width of the light valve or image frame in the offset direction, and the values of H are all positive values. For example, in the present embodiment, the A value of the light valve 110 can be obtained by taking a negative value from the distance L _A illustrated in FIG. 1, and the H value of the light valve 110 is the distance L _{H in} FIG. In addition, the A value of the image frame 60 can be obtained by taking a positive value from the distance L _A ' shown in FIG. 1 , and the H value of the image frame 60 is the distance L _H ' in FIG. 1 .

The projection lens 120 includes a lens group 122 and an imaging element 124. The lens group 122 is disposed on the transmission path of the image beam 112. The imaging element 124 is disposed on the transmission path of the image beam 112 and disposed between the lens group 122 and the screen 50 such that X% < Y%.

In particular, the imaging element 124 includes an imaging light transmissive sheet 210 having a first light passage region 212 adapted to pass the image beam 112. The first light passing region 212 has a first end E1 and a second end E2, and a first extending direction T1 from the first end E1 to the second end E2 is less than 90 degrees from the second direction D2, and The thickness W1 of the first light passage region 212 at the second end E2 is greater than the thickness W1 of the first light passage region 212 at the first end E1. In this embodiment, the thickness W1 of the first light passing region 212 is increased from the first end E1 to the second end E2. In addition, the first light-passing area 212 has a first light-incident surface S1 and a first light-emitting surface S2, and the first light-emitting surface S2 is disposed between the first light-incident surface S1 and the screen 50, and the first light-incident surface The surface S1 and the first light-emitting surface S2 are each a plane. In other words, in the present embodiment, the image-transparent sheet 210 is a light-transmitting crucible.

Since the projection lens 120 of the present embodiment has the imaging element 124, and the thickness W1 of the first light passing region 212 of the photosensitive transparent sheet 210 is increased from the first end E1 to the second end E2, the image light beam 112 is passing. Image After element 124, it will deflect in the second direction D2, making Y%>X%. In this way, when the offset of the image frame required by the environment is the same, the offset of the light valve 110 in the projection apparatus 100 using the projection lens 120 of the embodiment can be designed to be small enough to achieve The required image screen offset. When the offset of the light valve 110 is designed to be small, the maximum field of the projection lens 120 can be made small, so that the outer diameter of the lens in the projection lens 120 can be shortened. The concept of the maximum field will be described below with reference to FIGS. 2A and 2B.

2A and 2B illustrate the maximum field at the offset of two different light valves. Referring first to FIG. 1 and FIG. 2A, when the optical axis P of the projection lens 120 is located at the edge of the light valve 110, the A value of the light valve 110 is 0, and the formula for the above offset can be obtained as an offset of 100%. . Assuming that the H/2 value of the light valve 110 is 1.9 mm, the optical axis P is 1.9 mm from the center C of the light valve 110, and the half width of the light valve 110 perpendicular to the offset direction is 3.3 mm, the optical axis P to light The distance at the furthest position on the valve 110 (i.e., the farthest corner to the light valve 110) is calculated to be 4.9 mm via the Pythagorean theorem, and this distance is the projection lens 120 in this configuration. Maximum field.

Referring to FIG. 1 and FIG. 2B again, when the optical axis P of the projection lens 120 intersects the light valve 110, for example, 0.9 mm from the center C of the light valve 110, the A value of the light valve 110 is negative at this time, so the light The offset of valve 110 will be less than 100%, i.e., less than the offset of Figure 2A. The position of the optical axis P to the farthest position on the light valve 110 is 3.8 mm calculated by the Bies' theorem, and this distance is the maximum field of the projection lens 120 in this configuration. Compared to 2A, the maximum field of FIG. 2B is small, and it can be seen that when the offset of the light valve 110 is reduced, the maximum field of the projection lens 120 is also reduced.

Since the maximum field of the projection lens 120 of the embodiment is small, the outer diameter of the lens in the projection lens 120 can be designed to be small, so that the volume of the projection lens 120 occupying the projection device 100 is small, thereby making the embodiment The volume of the projection device 100 is reduced. For example, if the offset of the desired image frame 60 is 100%, the offset of the light valve 110 may be less than 100% by the action of the imaging element 124. As shown in FIG. 2B, assuming that the offset of the light valve 110 is 50%, the maximum field height of the lens is 3.8 mm. At this time, the diameter of the lens in the projection lens 120 is only 7.6 mm, which is enough to project a good quality image, and the thickness of the projection device 100 can be reduced by 23%.

In addition, when the maximum field of the projection lens 120 is reduced, the design difficulty of the projection lens 120 can also be reduced, and the cost and weight of the projection device 100 and the projection lens 120 can be reduced.

FIG. 3 is a schematic structural diagram of a projection apparatus 100a according to another embodiment of the present invention. Referring to FIG. 3, the projection apparatus 100a of the present embodiment is similar to the above-described projection apparatus 100, and the difference between the two is as follows. The imaging element 124a of the projection lens 120a of the projection device 100a further includes a compensation transparent sheet 220 disposed between the image-transparent sheet 210 and the screen 50. The compensation light transmissive sheet 220 has a second light passage region 222 adapted to pass the image light beam 112, and the second light passage region 222 has a third end E3 and a fourth end E4. An angle between a second extending direction T2 from the third end E3 to the fourth end E4 and the second direction D2 is less than 90 degrees, and the second light passing region 222 The thickness W2 at the fourth end E4 is smaller than the thickness W2 of the second light passage region 222 at the third end E3. In this embodiment, the thickness W2 of the second light passage region 222 is increased from the fourth end E4 to the third end E3.

In addition, in the embodiment, the second light passing region 222 has a pair of second light incident surface S3 and a second light exit surface S4. The second light-emitting surface S4 is disposed between the second light-incident surface S3 and the screen 50, and the second light-incident surface S3 and the second light-emitting surface S4 are each a plane. In other words, in the present embodiment, the compensation transparent sheet 220 is a light transmitting ridge. The first light-emitting surface S2 is disposed between the first light-incident surface S1 and the compensation light-transmitting sheet 220, and the second light-emitting surface S4 is disposed between the second light-incident surface S3 and the screen 50. In this embodiment, the second light incident surface S3 bears against the first light exit surface S2, and the shape of the second light incident surface S3 substantially coincides with the shape of the first light exit surface S2, that is, both are flat.

The compensation transparent sheet 220 can be used to compensate for the chromatic dispersion and aberrations that may occur in the image-transparent sheet 210, so that the image frame 60 projected by the projection device 100a has lower dispersion and aberration, thereby enhancing the image frame 60. quality.

4 is a schematic structural view of a projection apparatus according to still another embodiment of the present invention. Referring to FIG. 4, the projection apparatus 100b of the present embodiment is similar to the projection apparatus 100a (shown in FIG. 3), and the difference between the two is as follows. In the projection lens 120b of the projection device 100b, one of the first light incident surface S1' and the first light incident surface S2' of the image-transparent sheet 210b of the imaging element 124b is a plane, and the first light-incident surface S1 The other of 'the first light exiting surface S2' is a curved surface. In the present embodiment, the first light incident surface S1' is a curved surface, and the first light exiting surface S2' is a flat surface. In addition, one of the second light incident surface S3' and the second light exit surface S4' of the compensation light transmissive sheet 220b of the imaging element 124b is flat. The other side of the second light incident surface S3' and the second light exit surface S4' is a curved surface. In this embodiment, the second light-emitting surface S4' is also a curved surface, and the second light-incident surface S3' is a flat surface. In other words, in the embodiment, both the image-transparent sheet 210b and the compensation-transparent sheet 220b are lenses. The use of the image-transparent sheet 210b having the curved surface and the compensation-transparent sheet 220b can have the function of converging or diverging the image beam 112 in addition to X% < Y%.

In other embodiments, the imaging element 124b may also be the only light transmissive sheet 210b, but not the compensating light transmissive sheet 220b.

FIG. 5 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to FIG. 5, the projection device 100c of the present embodiment is similar to the projection device 100b (shown in FIG. 4), and the difference between the two is as follows. In the projection lens 120c of the projection device 100c of the present embodiment, the first light-emitting surface S2' of the image-transparent sheet 210c of the imaging element 124c is a curved surface, and the second of the compensation light-transmitting sheet 220c of the imaging element 124c The entrance surface S3' is a curved surface. The second light incident surface S3' bears against the first light exiting surface S2', and the shape of the second light incident surface S3' substantially coincides with the shape of the first light exiting surface S2'. In the present embodiment, the second light incident surface S3' is a concave surface, and the first light exiting surface S2' is a convex surface, and the concave surface is curved along with the convex surface.

In other embodiments, the second light incident surface S3 ′ of the compensation transparent sheet 220 c may not bear against the first light emitting surface S2 ′, and the shape of the second light incident surface S3 ′ and the first light emitting surface S2 ′. The shape may not substantially match.

In other embodiments, the imaging element 124c may also be only the imaging light transmissive sheet 210c, and does not include the compensation light transmissive sheet 220c.

FIG. 6 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention; Figure. Referring to FIG. 6, the projection device 100d of the present embodiment is similar to the projection device 100 (shown in FIG. 1), and the difference between the two is as follows. The lens group 122d of the projection lens 120d of the projection apparatus 100d of the present embodiment includes a plurality of eccentric lenses 123, and the geometric center C1 of the eccentric lens 123 is maintained at a distance d1 from the optical axis P of the projection lens 120d. The eccentric lens 123 can be used to correct aberrations and chromatic aberrations of the image frame 60 to improve the quality of the image frame 60. In other embodiments, the projection lens 120d may also employ an eccentric lens 123 to correct the aberration.

FIG. 7 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to FIG. 7, the projection device 100e of the present embodiment is similar to the projection device 100 (shown in FIG. 1), and the difference between the two is as follows. The lens group 122e of the projection lens 120e of the projection apparatus 100e of the present embodiment includes a plurality of tilting lenses 123e, and the optical axis X of the tilting lens 123e is inclined with respect to the optical axis P of the projection lens 120e. The tilt lens 123e can be used to correct aberrations and chromatic aberrations of the image frame 60 to improve the quality of the image frame 60. In other embodiments, the projection lens 120e may also employ a tilting lens 123e to correct the aberration.

FIG. 8 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to FIG. 8, the projection device 100f of the present embodiment is similar to the projection device 100 (shown in FIG. 1), and the difference between the two is as follows. The normal vector 115 of the active surface 114 of the light valve 110 in the projection device 100f of the present embodiment is inclined with respect to the optical axis P of the projection lens 120, so that the aberration and chromatic aberration of the image frame 60 can be corrected to improve the quality of the image frame 60.

It is worth noting that although the projections shown in Figure 1 and Figures 3 to 8 The architecture of the device is exemplified by a field mirror telecentric architecture, but the invention is not limited thereto. In other embodiments, the projection device may also employ a total internal reflection prism (TIR prism) telecentric architecture, a folding mirror non-telecentric architecture, or other projection architecture, as will be described below. Two embodiments are described in detail.

FIG. 9 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention. Referring to FIG. 9, the projection device 100g of the present embodiment is similar to the projection device 100 (shown in FIG. 1), and the difference between the two is that the projection device 100g replaces the projection device 100 with an internal total reflection 稜鏡 140g. Field mirror 140 (as shown in Figure 1). The internal total reflection mirror 140g has a total reflection surface 142 that reflects the illumination beam 132 from the illumination system 130 to the light valve 110, and the image beam 112 formed by the light valve 110 passes through the total reflection surface 142 and is transmitted to Projection lens 120.

FIG. 10 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to FIG. 10, the projection device 100h of the present embodiment is similar to the projection device 100 (shown in FIG. 1), and the difference between the two is that the projection device 100h replaces the field lens in the projection device 100 with a folding mirror 140h. 140 (as shown in Figure 1). The folding mirror 140h is disposed on the transmission path of the illumination beam 132 of the illumination system 130 to reflect the illumination beam 132 to the light valve 110.

FIG. 11 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to FIG. 11, the projection apparatus 100i of the present embodiment is similar to the projection apparatus 100c of FIG. 5, and the difference between the two is as follows. In the projection apparatus 100i of the present embodiment, the imaging of the imaging element 124i of the projection lens 120i The first light incident surface S1 of the light-transmitting sheet 210i is a flat surface, and the second light-emitting surface S4 of the compensation light-transmitting sheet 220i of the imaging element 124i is a flat surface.

In summary, the projection lens of the embodiment of the present invention adopts an imaging element, wherein the thickness of the first light passage region of the image-transmitting sheet at the second end is greater than the thickness of the first light passage region at the first end. . The offset of the image frame relative to the optical axis can be increased by the refraction of the image-transparent sheet, so that the offset of the light valve relative to the optical axis can be designed to be smaller, thereby shortening the maximum field. In this way, the outer diameter of the lens in the projection lens can be small, so that the volume of the projection lens is reduced, the weight is reduced, the design difficulty is reduced, and the cost is reduced. In addition, since the projection device of the embodiment of the present invention adopts the projection lens, the projection lens does not occupy a space, and thus the volume of the projection device can be reduced. Further, the projection apparatus using the projection lens of the embodiment of the present invention is light in weight and low in cost.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

50‧‧‧ screen

60‧‧‧Image screen

100, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100i‧‧‧ projector

110‧‧‧Light valve

112‧‧‧Image beam

114‧‧‧Active surface

115‧‧‧French vector

120, 120a, 120b, 120c, 120d, 120e, 120i‧‧‧ projection lens

122, 122d, 122e‧‧‧ lens groups

123‧‧‧Eccentric lens

123e‧‧‧ tilting lens

124, 124a, 124b, 124c, 124i‧‧‧ imaging elements

130‧‧‧Lighting system

132‧‧‧ illumination beam

140‧‧ ‧ field mirror

140g‧‧‧Internal total reflection稜鏡

140h‧‧ ‧ mirror

142‧‧‧ total reflection surface

210, 210b, 210c, 210i‧‧‧

212‧‧‧First light passage area

220, 220b, 220c, 220i‧‧‧Compensation transparencies

222‧‧‧Second light passage area

C‧‧‧ Center

C1‧‧‧Geometry Center

D1‧‧‧ first direction

D2‧‧‧ second direction

D1‧‧‧ distance

E1‧‧‧ first end

F2‧‧‧ second end

E3‧‧‧ third end

E4‧‧‧ fourth end

L _A , L _A ', L _H , L _H '‧‧‧ distance

P, X‧‧‧ optical axis

S1, S1’‧‧‧ first light surface

S2, S2’‧‧‧ first light surface

S3, S3’‧‧‧ second entrance

S4, S4’‧‧‧ second shiny surface

T1‧‧‧First extension direction

T2‧‧‧ second extension direction

W1, W2‧‧‧ thickness

1 is a schematic structural view of a projection apparatus according to an embodiment of the present invention.

2A and 2B illustrate the most offset of two different light valves Big game.

FIG. 3 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention.

4 is a schematic structural view of a projection apparatus according to still another embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.

FIG. 9 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention.

FIG. 10 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.

FIG. 11 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.

50‧‧‧ screen

60‧‧‧Image screen

100‧‧‧Projection device

110‧‧‧Light valve

112‧‧‧Image beam

120‧‧‧Projection lens

122‧‧‧ lens group

124‧‧‧Digital components

130‧‧‧Lighting system

132‧‧‧ illumination beam

140‧‧ ‧ field mirror

210‧‧‧歪光光片

212‧‧‧First light passage area

D1‧‧‧ first direction

D2‧‧‧ second direction

E1‧‧‧ first end

E2‧‧‧ second end

L _A , L _A ', L _H , L _H '‧‧‧ distance

P‧‧‧ optical axis

S1‧‧‧ first light surface

S2‧‧‧ first light surface

T1‧‧‧First extension direction

W1‧‧‧ thickness

Claims (18)

A projection device is adapted to project an image on a screen, the projection device comprising: a light valve adapted to generate an image beam; and a projection lens disposed on the transmission path of the image beam and disposed on the Forming the image between the light valve and the screen by projecting the image beam onto the screen, wherein the projection lens has an optical axis, and the light valve is offset by an X% offset in a first direction The optical axis, the image frame is offset from the optical axis by a Y% offset in a second direction, the first direction being opposite to the second direction, the first direction being perpendicular to the optical axis, and the second The direction is perpendicular to the optical axis, and the offset of the light valve is defined as [(A ₁ + H ₁ /2) / (H ₁ /2)] × 100%, and the offset of the image picture is defined as [(A ₂ + H ₂ /2) / (H ₂ /2)] × 100%, where A _{1 is} the distance from the edge of the light valve closer to the optical axis to the optical axis, and A _{2 is the} comparison of the image a distance from an edge of the optical axis to the optical axis, H ₁ is a width of the light valve in an offset direction thereof, and H ₂ is a width of the image frame in an offset direction thereof, the projection The lens includes: a lens group disposed on the transmission path of the image beam; and an imaging element disposed on the transmission path of the image beam and disposed between the lens group and the screen to enable X% <Y%, wherein the imaging element comprises an anamorphic transmissive sheet having a first light passage region adapted to pass the image beam, the first light passage region having a relative one An angle between a first extending direction of the first end and the second end and the second direction is less than 90 degrees, and a thickness of the first light passing region at the second end is greater than the first end A light passes through the region at the thickness of the first end. The projection device of claim 1, wherein the thickness of the first light passage region is increased from the first end to the second end. The projection device of claim 1, wherein the first light passing region has a first light incident surface and a first light emitting surface, and the first light emitting surface is disposed on the first light incident surface. Between the screens, the first light-incident surface and the first light-emitting surface are each a plane, and the image-transparent sheet is a light-transmissive sheet. The projection device of claim 1, wherein the first light passing region has a first light incident surface and a first light emitting surface, and the first light emitting surface is disposed on the first light incident surface. Between the screens, the first light-incident surface and the first light-emitting surface are each a curved surface, and the image-transparent sheet is a lens. The projection device of claim 1, wherein the first light passing region has a first light incident surface and a first light emitting surface, and the first light emitting surface is disposed on the first light incident surface. Between the first light-incident surface and the first light-emitting surface, the first light-incident surface and the first light-emitting surface are a plane, and the image is transparent. The piece is a lens. The projection device of claim 1, wherein the imaging element further comprises a compensating light transmissive sheet disposed between the image transmissive sheet and the screen, the compensating translucent sheet having a suitable The image beam passes through a second light passage region, the second light passage region has a third end and a fourth end opposite to each other, and a second extending direction from the third end to the fourth end is less than 90 degrees from the second direction And the thickness of the second light passage region at the fourth end is smaller than the thickness of the second light passage region at the third end. The projection device of claim 6, wherein the thickness of the second light passage region is increased from the fourth end to the third end. The projection device of claim 6, wherein the second light passing region has a second light incident surface and a second light emitting surface, and the second light emitting surface is disposed on the second light incident surface. Between the screens, the second light-incident surface and the second light-emitting surface are each a plane, and the compensation light-transmissive sheet is a light-transmitting aperture. The projection device of claim 6, wherein the second light passing region has a second light incident surface and a second light emitting surface, and the second light emitting surface is disposed on the second light incident surface. Between the screens, the second light-incident surface and the second light-emitting surface are each a curved surface, and the compensation light-transmitting sheet is a lens. The projection device of claim 6, wherein the second light passing region has a second light incident surface and a second light emitting surface, and the second light emitting surface is disposed on the second light incident surface. Between the two screens, the second light-incident surface and the second light-emitting surface are a curved surface, and the second light-incident surface and the second light-emitting surface are a plane, and the compensation light-transmissive sheet is a lens. The projection device of claim 6, wherein the first light passage region has a first light incident surface and a first light exiting surface The first light-emitting surface is disposed between the first light-incident surface and the compensation light-transmitting sheet, and the second light-passing region has a second light-incident surface and a second light-emitting surface, and the second light-emitting surface The surface is disposed between the second light incident surface and the screen, the second light incident surface is supported by the first light emitting surface, and the shape of the second light incident surface is substantially opposite to the shape of the first light emitting surface Match. The projection device of claim 1, wherein a normal vector of an active surface of the light valve is inclined relative to the optical axis. The projection apparatus of claim 1, wherein the lens group comprises at least one tilting lens, an optical axis of the tilting lens being inclined with respect to the optical axis of the projection lens. The projection device of claim 1, wherein the lens group comprises at least one eccentric lens, the geometric center of the eccentric lens being maintained at a distance from the optical axis of the projection lens. A projection device is adapted to project an image on a screen, the projection device comprising: a light valve adapted to generate an image beam; and a projection lens disposed on the transmission path of the image beam and disposed on the Between the light valve and the screen, the image beam is formed by projecting the image beam onto the screen, wherein the projection lens has an optical axis, and the light valve is offset from the optical axis in a first direction, the image frame Deviating from the optical axis in a second direction, the first direction being opposite to the second direction, the first direction being perpendicular to the optical axis, and the second direction being perpendicular to the optical axis, the projection lens comprising: a lens a group, disposed on the transmission path of the image beam; And an image component disposed on the transmission path of the image beam and disposed between the lens group and the screen, wherein the imaging component comprises an image-transparent film, and the image-transparent film has a suitable image a first light passage region through which the image beam passes, the first light passage region having a first end and a second end, a first extending direction from the first end to the second end, and the first The angle between the two directions is less than 90 degrees, and the thickness of the first light passage region at the second end is greater than the thickness of the first light passage region at the first end. The projection device of claim 15, wherein the imaging element further comprises a compensating light transmissive sheet disposed between the image transmissive sheet and the screen, the compensating translucent sheet having a suitable a second light passing region through which the image beam passes, the second light passing region having a third end and a fourth end opposite, a second extending direction from the third end to the fourth end and the second direction The angle is less than 90 degrees, and the thickness of the second light passage region at the fourth end is smaller than the thickness of the second light passage region at the third end. A projection lens adapted to project an image beam generated by a light valve onto a screen to generate an image frame, the projection lens comprising: an optical axis, wherein the light valve is X% in a first direction The offset of the image is offset from the optical axis by a Y% offset in a second direction, and the first direction is opposite the second direction, the first direction being perpendicular to the light An axis, and the second direction is perpendicular to the optical axis, and the offset of the light valve is defined as [(A ₁ +H ₁ /2)/(H ₁ /2)]×100%, the offset of the image frame The quantity is defined as [(A ₂ +H ₂ /2)/(H ₂ /2)]×100%, where A ₁ is the distance of the light valve from one edge of the optical axis to the optical axis, A ₂ For the distance of the image picture from the edge of the optical axis to the optical axis, H ₁ is the width of the light valve in the offset direction thereof, and H ₂ is the width of the image frame in the offset direction thereof; a lens group disposed on the transmission path of the image beam; and an imaging element disposed on the transmission path of the image beam and disposed between the lens group and the screen such that X% < Y%, among them The imaging element includes an image-transparent sheet having a first light passage region adapted to pass the image beam, the first light passage region having a first end and a second An angle between a first extending direction of the first end and the second end and the second direction is less than 90 degrees, and a thickness of the first light passing region at the second end is greater than a first light passing region at the first The thickness of one end. The projection lens of claim 17, wherein the imaging element further comprises a compensating light transmissive sheet disposed between the image transmissive sheet and the screen, the compensating translucent sheet having a suitable a second light passing region through which the image beam passes, the second light passing region having a third end and a fourth end opposite, a second extending direction from the third end to the fourth end and the second direction The angle is less than 90 degrees, and the thickness of the second light passage region at the fourth end is smaller than the thickness of the second light passage region at the third end.